It isn't the e-tailer you buy it from that bundles the PSU with the case it is the company that makes the case itself that bundles the PSU. In any case bundled PSU/Case combos' PSUs are most always of low quality. It's kind of a gimmick. If the PSU is a name brand enermax that comes with the case you might be ok though.
First thing I would do if possible is eyeball the case. Since these are "in stock" in the various stores..if you can take a look at the interior layout, do so. The limited descriptions are a little light on information. 2nd - if you like the case, the prices are really good..buy one with the firm knowledge that the psu is probably doo doo. Worst case scenario - sell the psu for $15 on e-bay with $15 shipping and handling and think of it as a DIY rebate.